OpenSnitch is a GNU/Linux port of the Little Snitch firewall
HTTP proxy to block ads and customize webpages
Intelligently block brute-force attacks by aggregating system logs
Robust and flexible VPN network tunnelling
blocklists for openbsd,freebsd,linux,iptables,bsd pf,pf,ipfilter
PeerGuardian - a privacy oriented firewall application
Webinterface to (un)ban IPs in Fail2Ban
A client for the MikroTik RouterOS API protocol, written in PHP.
Block or allow connections by country address blocks
A MAC address based user authentication system for campus-wide network
A simple captive portal
Easy to use firewall for linux beginners.
Drop specified IP n seconds remotely, auto-undrop it when timeout.
iptables web interface